RSES Condenser Systems 4

Question 1

On a hot day, an air-cooled condenser fan motor trips on thermal overload repeatedly. The most likely cause is:

Accepted Answer

High ambient temperature causing high amp draw

Answer

High ambient temperatures increase condensing pressure, which raises the load on condenser fans and can cause motor overloads to trip.

Question 2

What is the primary advantage of a microchannel condenser coil over a round-tube plate-fin coil?

Accepted Answer

Lower refrigerant charge and improved heat transfer efficiency

Answer

Microchannel coils use multiple small parallel channels that improve heat transfer efficiency and significantly reduce refrigerant charge compared to round-tube designs.

Question 3

A condenser pressure too low in cold ambient conditions can cause which operational problem?

Accepted Answer

Liquid floodback to the compressor due to low pressure differential

Answer

Very low condensing pressure reduces the pressure differential across the metering device, causing refrigerant to flood back as liquid to the compressor.

Question 4

When checking a water-cooled condenser with a refrigerant analyzer, where should refrigerant NOT be vented?

Accepted Answer

Into the condenser water loop

Answer

Venting refrigerant into the condenser water loop contaminates the water system and violates EPA Section 608 venting prohibitions.

Question 5

The term 'head pressure control' in variable-speed condenser fans refers to:

Accepted Answer

Modulating fan speed to keep condensing pressure within a target range

Answer

Head pressure control via variable-speed fans modulates airflow to maintain the condensing pressure within an optimal range across varying ambient conditions.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES Condenser Systems 4